@Cedric does this naveMesh work for my sation How to create a path root like google maps 
I’m waiting or ur merging.
I tried with a* algoritm but I find difficultes in the implemnetation in 3d.
does the solution of agents will draw a logical path between two point for example :
if I want to go from point A which is “technical local” in level 1 to “exit door” level 3, does it give me a logical path like a human behavior
I’m lost